* Changed drone exit code from -1 to 1 'coz typically exit codes are
between 0 and 255
* Detect and report drone TCP port bind failure
* In all the following drone errors are reported (including previous
commits) -
* Drone already running (TCP port bind failure)
* Drone executable not found
* Packet.dll not found (Win32 only)
* The following conditions should NOT be reported
* Start/Stop Ostinato
* Stop before 5sec
* Stop after 5sec
